Setting maximum height for all images displayed in wigdets

Hi,

Thank you for reaching out to us.

Please read this article – https://www.8theme.com/documentation/xstore/woocommerce/product-images/ To apply settings for images from Appearance > Customize > WooCommerce > Product Images you need to regenerate thumbnails using appropriate plugin.
These settings for images come from WooCommerce plugin, not from our theme, you will get the same result on the Shop page even after activating another theme, not XStore.
We would recommend you use a graphics editor and prepare product images (make them the same size) before uploading images to your media gallery, or you can use the CROP option 1:1.

If our recommendation doesn’t solve your request, we would recommend you contact support of WooCommerce – https://wordpress.org/support/plugin/woocommerce/
We hope this information is helpful.

Warm Regards,
The 8Theme Team